集成光子波导中机电增强布里渊散射的理论框架
A Theoretical Framework for Electromechanically Reinforced Brillouin Scattering in Integrated Photonic Waveguides
AI总结：
本文建立非中心对称材料波导中压电耦合下的布里渊散射理论，证明叉指换能器注入声波可机电增强 SBS，并在砷化镓纳米线中实现数量级提升的斯托克斯放大。
摘要：
目前，关于由中心对称材料构成的波导中受激布里渊散射（SBS）的理论论证，未能捕捉由非中心对称材料构成的波导中该现象的物理机制。后一问题中的 SBS 因压电效应而涉及电波与声波的相互耦合，并最终产生不同于中心对称材料中的功率转换方程。在本研究中，我们从理论上研究了由叉指换能器（Inter-Digital-Transducer）激发时，采用非中心对称材料的芯片级波导中的布里渊散射。我们解释了在存在外部注入声波的情况下如何表述布里渊散射，并证明了此外部信号对增强受激布里渊散射的作用。作为案例研究，我们研究了砷化镓纳米线中的 SBS。结果表明，该波导中由机电增强 SBS 导致的斯托克斯放大，可比已报道的硅纳米线中 SBS 的数值高出数个数量级；这使得实现给定斯托克斯放大所需的波导长度能够从数厘米缩短至数百微米。
英文摘要：
Current theoretical demonstration of the Stimulated Brillouin scattering (SBS) in waveguides composed of centrosymmetric materials does not capture physics of the phenomenon in waveguides composed of non-centrosymmetric materials. The SBS in the latter problem, entails mutual coupling of the electric and acoustic waves due to piezoelectricity, and ends up to a different power conversion equation than that in a centrosymmetric material. In this study, we theoretically investigate Brillouin scattering in chip-scale waveguides with non-centrosymmetric material when excited by an Inter-Digital-Transducer. We explain how Brillouin scattering is formulated in the presence of externally injected acoustic waves. Also we demonstrate the effect of this external signal on reinforcing Stimulated Brillouin scattering. As a case study we study SBS in a gallium arsenide nonowire. It is shown that the Stokes amplification due to electromechanically reinforced SBS in this waveguide can grow several orders of magnitude higher than the values reported for the SBS in a silicon nanowire; This enables reducing the waveguide length required for a given Stokes amplification from centimeters to few hundred micrometers.
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